public class ConnectionServlet
Responds to a ping that comes from browser through XMLHttpRequest to reset the web server
session timeout again.
This is useful in maintaining session active between the time user is inactive and the time he comes back and uses
the application without making the request through hiddenframe (which was the only element that used to reset the session timeout
until this class's need).
public void doGet(javax.servlet.http.HttpServletRequest request,
Receives XMLHttpRequest from browser after the pre-logout session time-out threshhold has been reached.
Receiving this request should automatically reset the web server session. However, this Servlet needs
to send reponse back to the frontend to restart its timer as well.